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Commensurate harmonic oscillators: classical symmetries

Amiet, J-P. and Weigert, S. (2002) Commensurate harmonic oscillators: classical symmetries. Journal of Mathematical Physics, 43 (8). pp. 4110-4126. ISSN 1089-7658

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The symmetry properties of a classical N-dimensional harmonic oscillator with rational frequency ratios are studied from a global point of view. A commensurate oscillator possesses the same number of globally defined constants of motion as an isotropic oscillator. In both cases invariant phase-space functions form the algebra su(N) with respect to the Poisson bracket. In the isotropic case, the phase-space flows generated by the invariants can be integrated globally to a set of finite transformations isomorphic to the group SU(N). For a commensurate oscillator, however, the group SU(N) of symmetry transformations is found to exist only on a reduced phase space, due to unavoidable singularities of the flow in the full phase space. It is therefore crucial to distinguish carefully between local and global definitions of symmetry transformations in phase space. This result solves the longstanding problem of which symmetry to associate with a commensurate harmonic oscillator.

Item Type: Article
Institution: The University of York
Academic Units: The University of York > Mathematics (York)
Depositing User: York RAE Import
Date Deposited: 17 Apr 2009 14:43
Last Modified: 17 Apr 2009 14:43
Published Version: http://dx.doi.org/10.1063/1.1488672
Status: Published
Publisher: American Institute of Physics
Identification Number: 10.1063/1.1488672
URI: http://eprints.whiterose.ac.uk/id/eprint/6779

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